This could be a non-problem or a serious problem. Some photos would help to determine the severity. It is one of Bill Cody's famous "it depends" situations.

There are a lot of factors. If you have some typical spring-time FA, it probably will not be a problem. Most ponds have some.

If you have a large mats of it growing on the bottom of your pond, and it is ready to break loose and float -- and then die, you will have a serious problem. It will consume the pond's oxygen when it dies, and thus the fish will die from a lack of oxygen.

There are remedies. Get us more info. Don't over-do any potential solution -- that can really be disastrous and can generate a situation that is extremely difficult to recover from. Too little of a solution might not be as bad, but it can still be very traumatic.

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